body {
  width: 100vw;
  height: 100vh;
  max-width: 1920px;
  background: rgba(255, 255, 255, 1);
  box-sizing: border-box;
  border-left: solid 1px rgba(223, 228, 234, 1);
  border-right: solid 1px rgba(223, 228, 234, 1);
  border-radius: 20px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.mainBox {
  box-sizing: border-box;
  padding: 100px 0 30px 0;
}

a {
  display: block;
  color: inherit; /*�̳и���Ԫ�ص���ɫ*/
  text-decoration: none;
}

.b-box {
  box-sizing: border-box;
}
